Kazuo Ohta

	2009
80		Yuichi Komano, Kazuo Ohta, Hideyuki Miyake, Atsushi Shimbo: Algorithmic Tamper Proof (ATP) Counter Units for Authentication Devices Using PIN. ACNS 2009: 306-323
79		Kazuo Sakiyama, Tatsuya Yagi, Kazuo Ohta: Fault Analysis Attack against an AES Prototype Chip Using RSL. CT-RSA 2009: 429-443
78		Yutaka Kawai, Kazuki Yoneyama, Kazuo Ohta: Secret Handshake: Strong Anonymity Definition and Construction. ISPEC 2009: 219-229
77		Lei Wang, Yu Sasaki, Kazuo Sakiyama, Kazuo Ohta: Bit-Free Collision: Application to APOP Attack. IWSEC 2009: 3-21
76		Kazuo Ohta: Foreword. IEICE Transactions 92-A(1): 1-2 (2009)
75		Bagus Santoso, Kazuo Ohta: A New 'On the Fly' Identification Scheme: An Asymptoticity Trade-Off between ZK and Correctness. IEICE Transactions 92-A(1): 122-136 (2009)
74		Takashi Nishide, Kazuki Yoneyama, Kazuo Ohta: Attribute-Based Encryption with Partially Hidden Ciphertext Policies. IEICE Transactions 92-A(1): 22-32 (2009)
73		Lei Wang, Kazuo Ohta, Noboru Kunihiro: Near-Collision Attacks on MD4: Applied to MD4-Based Protocols. IEICE Transactions 92-A(1): 76-86 (2009)
72		Jun Yajima, Terutoshi Iwasaki, Yusuke Naito, Yu Sasaki, Takeshi Shimoyama, Thomas Peyrin, Noboru Kunihiro, Kazuo Ohta: A Strict Evaluation on the Number of Conditions for SHA-1 Collision Search. IEICE Transactions 92-A(1): 87-95 (2009)
71		Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro: Extended Password Recovery Attacks against APOP, SIP, and Digest Authentication. IEICE Transactions 92-A(1): 96-104 (2009)
	2008
70		Takashi Nishide, Kazuki Yoneyama, Kazuo Ohta: Attribute-Based Encryption with Partially Hidden Encryptor-Specified Access Structures. ACNS 2008: 111-129
69		Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro: Password Recovery on Challenge and Response: Impossible Differential Attack on Hash Function. AFRICACRYPT 2008: 290-307
68		Jun Yajima, Terutoshi Iwasaki, Yusuke Naito, Yu Sasaki, Takeshi Shimoyama, Noboru Kunihiro, Kazuo Ohta: A strict evaluation method on the number of conditions for the SHA-1 collision search. ASIACCS 2008: 10-20
67		Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro: Security of MD5 Challenge and Response: Extension of APOP Password Recovery Attack. CT-RSA 2008: 1-18
66		Lei Wang, Kazuo Ohta, Noboru Kunihiro: New Key-Recovery Attacks on HMAC/NMAC-MD4 and NMAC-MD5. EUROCRYPT 2008: 237-253
65		Kazuki Yoneyama, Satoshi Miyagawa, Kazuo Ohta: Leaky Random Oracle (Extended Abstract). ProvSec 2008: 226-240
64		Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta, Makoto Sano, Masahiko Takenaka: Sanitizable and Deletable Signature. WISA 2008: 130-144
63		Yutaka Kawai, Shotaro Tanno, Takahiro Kondo, Kazuki Yoneyama, Noboru Kunihiro, Kazuo Ohta: Extension of Secret Handshake Protocols with Multiple Groups in Monotone Condition. WISA 2008: 160-173
62		Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura: Provably Secure Multisignatures in Formal Security Model and Their Optimality. IEICE Transactions 91-A(1): 107-118 (2008)
61		Bagus Santoso, Noboru Kunihiro, Naoki Kanayama, Kazuo Ohta: Factorization of Square-Free Integers with High Bits Known. IEICE Transactions 91-A(1): 306-315 (2008)
60		Yusuke Naito, Kazuo Ohta, Noboru Kunihiro: Improved Collision Search for Hash Functions: New Advanced Message Modification. IEICE Transactions 91-A(1): 46-54 (2008)
59		Yu Sasaki, Lei Wang, Noboru Kunihiro, Kazuo Ohta: New Message Differences for Collision Attacks on MD4 and MD5. IEICE Transactions 91-A(1): 55-63 (2008)
	2007
58		Kazuki Yoneyama, Haruki Ota, Kazuo Ohta: Secure Cross-Realm Client-to-Client Password-Based Authenticated Key Exchange Against Undetectable On-Line Dictionary Attacks. AAECC 2007: 257-266
57		Jun Yajima, Yu Sasaki, Yusuke Naito, Terutoshi Iwasaki, Takeshi Shimoyama, Noboru Kunihiro, Kazuo Ohta: A New Strategy for Finding a Differential Path of SHA-1. ACISP 2007: 45-58
56		Kazuki Yoneyama, Kazuo Ohta: Ring signatures: universally composable definitions and constructions. ASIACCS 2007: 374-376
55		Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro: New Message Difference for MD4. FSE 2007: 329-348
54		Masayuki Terada, Kazuki Yoneyama, Sadayuki Hongo, Kazuo Ohta: Modeling Agreement Problems in the Universal Composability Framework. ICICS 2007: 350-361
53		Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta, Masahiko Takenaka, Takashi Yoshioka: A Sanitizable Signature Scheme with Aggregation. ISPEC 2007: 51-64
52		Takashi Nishide, Kazuo Ohta: Multiparty Computation for Interval, Equality, and Comparison Without Bit-Decomposition Protocol. Public Key Cryptography 2007: 343-360
51		Haruki Ota, Kazuki Yoneyama, Shinsaku Kiyomoto, Toshiaki Tanaka, Kazuo Ohta: Universally Composable Hierarchical Hybrid Authenticated Key Exchange. IEICE Transactions 90-A(1): 139-151 (2007)
50		Yu Sasaki, Yusuke Naito, Noboru Kunihiro, Kazuo Ohta: Improved Collision Attacks on MD4 and MD5. IEICE Transactions 90-A(1): 36-47 (2007)
49		Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura: Toward the Fair Anonymous Signatures: Deniable Ring Signatures. IEICE Transactions 90-A(1): 54-64 (2007)
48		Takashi Nishide, Kazuo Ohta: Constant-Round Multiparty Computation for Interval Test, Equality Test, and Comparison. IEICE Transactions 90-A(5): 960-968 (2007)
47		Yoshikazu Hanatani, Yuichi Komano, Kazuo Ohta, Noboru Kunihiro: Provably Secure Untraceable Electronic Cash against Insider Attacks. IEICE Transactions 90-A(5): 980-991 (2007)
	2006
46		Masahiro Mambo, Moises Rosales Salinas, Kazuo Ohta, Noboru Kunihiro: Problems on the MR micropayment schemes. ASIACCS 2006: 363
45		Yusuke Naito, Yu Sasaki, Takeshi Shimoyama, Jun Yajima, Noboru Kunihiro, Kazuo Ohta: Improved Collision Search for SHA-0. ASIACRYPT 2006: 21-36
44		Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura: Toward the Fair Anonymous Signatures: Deniable Ring Signatures. CT-RSA 2006: 174-191
43		Yoshikazu Hanatani, Yuichi Komano, Kazuo Ohta, Noboru Kunihiro: Provably Secure Electronic Cash Based on Blind Multisignature Schemes. Financial Cryptography 2006: 236-250
42		Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura: Formal Security Model of Multisignatures. ISC 2006: 146-160
41		Bagus Santoso, Noboru Kunihiro, Naoki Kanayama, Kazuo Ohta: Factorization of Square-Free Integers with High Bits Known. VIETCRYPT 2006: 115-130
40		Yu Sasaki, Yusuke Naito, Jun Yajima, Takeshi Shimoyama, Noboru Kunihiro, Kazuo Ohta: How to Construct Sufficient Conditions for Hash Functions. VIETCRYPT 2006: 243-259
39		Yuichi Komano, Kazuo Ohta: Taxonomical Security Consideration of OAEP Variants. IEICE Transactions 89-A(5): 1233-1245 (2006)
38		Mitsugu Iwamoto, Lei Wang, Kazuki Yoneyama, Noboru Kunihiro, Kazuo Ohta: Visual Secret Sharing Schemes for Multiple Secret Images Allowing the Rotation of Shares. IEICE Transactions 89-A(5): 1382-1395 (2006)
37		Noboru Kunihiro, Wataru Abe, Kazuo Ohta: Maurer-Yacobi ID-Based Key Distribution Revisited. IEICE Transactions 89-A(5): 1421-1424 (2006)
	2005
36		Yusuke Naito, Yu Sasaki, Noboru Kunihiro, Kazuo Ohta: Improved Collision Attack on MD4 with Probability Almost 1. ICISC 2005: 129-145
35		Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura: On the Security of Probabilistic Multisignature Schemes and Their Optimality. Mycrypt 2005: 132-150
34		Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta, Takeshi Shimoyama: Analysis on the Clockwise Transposition Routing for Dedicated Factoring Devices. WISA 2005: 232-242
33		Norio Adachi, Satoshi Aoki, Yuichi Komano, Kazuo Ohta: Solutions to Security Problems of Rivest and Shamir's PayWord Scheme. IEICE Transactions 88-A(1): 195-202 (2005)
	2004
32		Yuichi Komano, Kazuo Ohta: Taxonomic Consideration to OAEP Variants and Their Security. ICICS 2004: 105-117
31		Yuichi Komano, Kazuo Ohta: OAEP-ES - Methodology of Universal Padding Technique. IEICE Transactions 87-A(1): 110-119 (2004)
	2003
30		Norio Adachi, Yuichi Komano, Satoshi Aoki, Kazuo Ohta: The Security Problems of Rivest and Shamir's PayWord Scheme. CEC 2003: 20-23
29		Yuichi Komano, Kazuo Ohta: Efficient Universal Padding Techniques for Multiplicative Trapdoor One-Way Permutation. CRYPTO 2003: 366-382
28		Kazuo Ohta, Tetsuo Nishino, Seiya Okubo, Noboru Kunihiro: A Quantum Algorithm Using NMR Computers to Break Secret-Key Cryptosystems. New Generation Comput. 21(4): (2003)
	2001
27		Silvio Micali, Kazuo Ohta, Leonid Reyzin: Accountable-subgroup multisignatures: extended abstract. ACM Conference on Computer and Communications Security 2001: 245-254
	1998
26		Kazuo Ohta, Dingyi Pei: Advances in Cryptology - ASIACRYPT '98, International Conference on the Theory and Applications of Cryptology and Information Security, Beijing, China, October 18-22, 1998, Proceedings Springer 1998
25		Kazuo Ohta, Tatsuaki Okamoto: On Concrete Security Treatment of Signatures Derived from Identification. CRYPTO 1998: 354-369
24		Masayuki Kanda, Youichi Takashima, Tsutomu Matsumoto, Kazumaro Aoki, Kazuo Ohta: A Strategy for Constructing Fast Round Functions with Practical Security Against Differential and Linear Cryptanalysis. Selected Areas in Cryptography 1998: 264-279
	1997
23		Yasuyoshi Kaneko, Shiho Moriai, Kazuo Ohta: On strict estimation method of provable security against differential and linear cryptanalysis. ICICS 1997: 258-268
22		Kazuo Ohta: Remarks on Blind Decryption. ISW 1997: 109-115
	1995
21		Kazuo Ohta, Shiho Moriai, Kazumaro Aoki: Improving the Search Algorithm for the Best Linear Expression. CRYPTO 1995: 157-170
	1994
20		Tatsuaki Okamoto, Kazuo Ohta: How to Simultaneously Exchange Secrets by General Assumptions. ACM Conference on Computer and Communications Security 1994: 184-192
19		Kazuo Ohta, Kazumaro Aoki: Linear Cryptanalysis of the Fast Data Encipherment Algorithm. CRYPTO 1994: 12-16
	1993
18		Kazuo Ohta, Mitsuru Matsui: Differential Attack on Message Authentication Codes. CRYPTO 1993: 200-211
	1992
17		Atsushi Fujioka, Tatsuaki Okamoto, Kazuo Ohta: A Practical Secret Voting Scheme for Large Scale Elections. AUSCRYPT 1992: 244-251
16		Kazuo Ohta, Tatsuaki Okamoto, Atsushi Fujioka: Secure Bit Commitment Function against Divertibility. EUROCRYPT 1992: 324-340
	1991
15		Kazuo Ohta, Tatsuaki Okamoto: A Digital Multisignature Scheme Based on the Fiat-Shamir Scheme. ASIACRYPT 1991: 139-148
14		Hikaru Morita, Kazuo Ohta, Shoji Miyaguchi: Results of Switching-Closure-Test on FEAL (Extended Abstract). ASIACRYPT 1991: 247-252
13		Hikaru Morita, Kazuo Ohta, Shoji Miyaguchi: A Switching Closure Test to Analyze Cryptosystems. CRYPTO 1991: 183-193
12		Tatsuaki Okamoto, Kazuo Ohta: Universal Electronic Cash. CRYPTO 1991: 324-337
11		Atsushi Fujioka, Tatsuaki Okamoto, Kazuo Ohta: Interactive Bi-Proof Systems and Undeniable Signature Schemes. EUROCRYPT 1991: 243-256
10		Tatsuaki Okamoto, David Chaum, Kazuo Ohta: Direct Zero Knowledge Proofs of Computational Power in Five Rounds. EUROCRYPT 1991: 96-105
	1990
9		Kazuo Ohta, Kenji Koyama: Meet-in-the-Middle Attack on Digital Signature Schemes. AUSCRYPT 1990: 140-154
8		Tatsuaki Okamoto, Kazuo Ohta: How to Utilize the Randomness of Zero-Knowledge Proofs. CRYPTO 1990: 456-475
7		Shoji Miyaguchi, Kazuo Ohta, Masahiko Iwata: Confirmation that Some Hash Functions Are Not Collision Free. EUROCRYPT 1990: 326-343
6		Kazuo Ohta, Tatsuaki Okamoto, Kenji Koyama: Membership Authentication for Hierarchical Multigroups Using the Extended Fiat-Shamir Scheme. EUROCRYPT 1990: 446-457
	1989
5		Tatsuaki Okamoto, Kazuo Ohta: Disposable Zero-Knowledge Authentications and Their Applications to Untraceable Electronic Cash. CRYPTO 1989: 481-496
4		Tatsuaki Okamoto, Kazuo Ohta: Divertible Zero Knowledge Interactive Proofs and Commutative Random Self-Reducibility. EUROCRYPT 1989: 134-148
	1988
3		Kazuo Ohta, Tatsuaki Okamoto: A Modification of the Fiat-Shamir Scheme. CRYPTO 1988: 232-243
2		Kenji Koyama, Kazuo Ohta: Security of Improved Identity-Based Conference Key Distribution Systems. EUROCRYPT 1988: 11-19
	1987
1		Kenji Koyama, Kazuo Ohta: Identity-based Conference Key Distribution Systems. CRYPTO 1987: 175-184

Coauthor Index

1	Wataru Abe	[37]
2	Norio Adachi	[30] [33]
3	Kazumaro Aoki	[19] [21] [24]
4	Satoshi Aoki	[30] [33]
5	David Chaum	[10]
6	Atsushi Fujioka	[11] [16] [17]
7	Yoshikazu Hanatani	[43] [47]
8	Sadayuki Hongo	[54]
9	Mitsugu Iwamoto	[38]
10	Terutoshi Iwasaki	[57] [68] [72]
11	Masahiko Iwata	[7]
12	Tetsuya Izu	[34] [53] [64]
13	Naoki Kanayama	[41] [61]
14	Masayuki Kanda	[24]
15	Yasuyoshi Kaneko	[23]
16	Yutaka Kawai	[63] [78]
17	Shin-ichi Kawamura	[35] [42] [44] [49] [62]
18	Shinsaku Kiyomoto	[51]
19	Yuichi Komano	[29] [30] [31] [32] [33] [35] [39] [42] [43] [44] [47] [49] [62] [80]
20	Takahiro Kondo	[63]
21	Kenji Koyama	[1] [2] [6] [9]
22	Noboru Kunihiro	[28] [34] [36] [37] [38] [40] [41] [43] [45] [46] [47] [50] [53] [55] [57] [59] [60] [61] [63] [64] [66] [67] [68] [69] [71] [72] [73]
23	Masahiro Mambo	[46]
24	Mitsuru Matsui	[18]
25	Tsutomu Matsumoto	[24]
26	Silvio Micali	[27]
27	Satoshi Miyagawa	[65]
28	Shoji Miyaguchi	[7] [13] [14]
29	Hideyuki Miyake	[80]
30	Shiho Moriai	[21] [23]
31	Hikaru Morita	[13] [14]
32	Yusuke Naito	[36] [40] [45] [50] [57] [60] [68] [72]
33	Takashi Nishide	[48] [52] [70] [74]
34	Tetsuo Nishino	[28]
35	Tatsuaki Okamoto	[3] [4] [5] [6] [8] [10] [11] [12] [15] [16] [17] [20] [25]
36	Seiya Okubo	[28]
37	Haruki Ota	[51] [58]
38	Dingyi Pei	[26]
39	Thomas Peyrin	[72]
40	Leonid Reyzin	[27]
41	Kazuo Sakiyama	[77] [79]
42	Moises Rosales Salinas	[46]
43	Makoto Sano	[64]
44	Bagus Santoso	[41] [61] [75]
45	Yu Sasaki	[36] [40] [45] [50] [55] [57] [59] [67] [68] [69] [71] [72] [77]
46	Atsushi Shimbo	[35] [42] [44] [49] [62] [80]
47	Takeshi Shimoyama	[34] [40] [45] [57] [68] [72]
48	Youichi Takashima	[24]
49	Masahiko Takenaka	[53] [64]
50	Toshiaki Tanaka	[51]
51	Shotaro Tanno	[63]
52	Masayuki Terada	[54]
53	Lei Wang	[38] [55] [59] [66] [67] [69] [71] [73] [77]
54	Tatsuya Yagi	[79]
55	Jun Yajima	[40] [45] [57] [68] [72]
56	Kazuki Yoneyama	[38] [51] [54] [56] [58] [63] [65] [70] [74] [78]
57	Takashi Yoshioka	[53]

Colors in the list of coauthors